How to Determine if It's Influenza A

Influenza A, also known as Type A flu, can be diagnosed through various aspects including epidemiological history, symptom presentation, antigen testing, nucleic acid testing, and routine blood tests.

1. Epidemiological history: Consider whether there has been recent contact with individuals infected with influenza A or exposure to places or areas experiencing outbreaks of influenza A. A history of contact may increase the likelihood of infection.

2. Symptom presentation: Influenza A typically has a sudden onset, often accompanied by high fever reaching 39-40°C or even higher, along with systemic symptoms such as headache, muscle pain, and fatigue. Respiratory symptoms like cough, runny nose, nasal congestion, and sore throat may also appear. Symptoms are generally more severe compared to those of the common cold.

3. Antigen testing: Antigen testing is convenient and rapid, providing results in a short time frame. Nucleic acid testing, on the other hand, is more accurate and can directly detect the presence of influenza A virus RNA.

4. Nucleic acid testing: By collecting respiratory secretions for testing, a positive result indicates that the patient has been infected with influenza A virus.

5. Routine blood tests: Blood tests of patients with influenza A may show normal or decreased total white blood cell count and a relative increase in lymphocytes. However, these findings are not absolute and should be interpreted in combination with other clinical information.

If you suspect you have contracted influenza A, seek medical attention promptly and inform your doctor about your symptoms and contact history to facilitate appropriate testing and diagnosis. While awaiting test results, ensure adequate rest, drink plenty of fluids, avoid going out, minimize contact with others, and prevent cross-infection.